Year	current US$
1975	4099990000
1976	4800040000
1977	4779990000
1978	5134510000
1979	5189730000
1980	5543090000
1981	6172560000
1982	5545320000
1983	10557000000
1984	7588100000
1985	15096330000
1986	17361760000
1987	20340330000
1988	26883910000
1989	40223970000
1990	39062500000
1991	44792500000
1992	32488700000
1993	39933390000
1994	47003330000
1995	56221940000
1996	71079200000
1997	93772820000
1998	98875480000
1999	97452590000
2000	111818640000
2001	85145500000
2002	76749870000
2003	121640960000
2004	151349870000